Circuit Tester (Model HSDT41001) is a digital diagnostic tool designed for measuring DC voltages from 1V to 100V, featuring an integrated LCD display, built-in flashlight, and a coiled cord with an alligator clamp.Test Range: DC 1–100VSafety Rating: CAT III 300VKey Features: Digital LCD display, backlighting, built-in flashlight, and data hold functionPower Source: Uses AAA batteries (included in double blister packaging)